Criteria to determine what gets cleaned up first

(Construction year and cost are estimates from the Strategic Plan as of Oct. 2023 - p. 21. Updates in parenthesis. This table may change after the Strategic Plan review, which is expected in 2026.)

2023: Phase 4A (completed)

2024: Phase 7 (completed Dec 2025 - prelim. total cost: $5.6 million)

2025: Phases 10 & 13; est. cost: $11.10 million (not yet started - ph 10 will be clustered with ph 11/12, and ph 13 will be completed with ph 14)

2026: Phases 11 & 14; est. cost: $9.52 million (not yet started - Ph 11 will be clustered with ph 10 & 12, and ph 14 will be completed with ph 13)

2027: Phase 12A; est. cost: $5.14 million (Will be clustered with phases 10 & 11)

2028: Phase 12B; est. cost: $5.14 million (Will be clustered with phases 10 & 11)

2029: Phase 4B; est. cost: $3.52 million

2030: Phase 8; est. cost: $5.13 million

2031: Phase 9; est. cost: $8.11 million

2032: Phase 17A; est. cost: $5.06 million

2033: Phase 17B; est. cost $5.06 million

2034 - 2038: Phases 18 - 22; est combined cost: $32.85 million

2040 - 2044: Monitoring and maintenance; est. total cost: $2.45 million

Phase 7:  (Completed Dec. 2025) This is the next downstream Phase that as of 2023 had not been completed, except for Phase 4B, described below. This phase is also a priority because it has high public use (Racetrack Pond).

Phases 13 /14: Phase 13 includes Arrowstone Park in Deer Lodge which has high public use. Phase 14 is a small area contiguous with Phase 13. These Phases will be completed concurrently with Phases 10 & 11 (now Phases 10-12)

Phases 10, 11 & 12: These phases have the highest risk of contamination reaching the river, based on erosion rates, and are considered to pose the most acute risk to aquatic habitat. They also have “relatively high” amounts of contamination, so completing these Phases earlier results in “substantial progress” toward the overall cleanup. Work in these phases would share a single infrastructure of haul roads as they can all be accessed from Sager Lane. 

Phase 4B: The next downstream Phase after Phases 10, 11 and 12 have been completed. 

Phases 8 & 9: The next downstream Phases after 4B. These Phases will have provided refuge for fish and wildlife during and after construction of Phases 7, 10, 11, and 12. 

Phases 17 through 22: These are the remaining downstream Phases. A large proportion of these Phases are under single ownership, so some of them may be combined to save costs on design and construction infrastructure. 

(From Strategic Plan, pp 12-13; updates in parenthesis)